GAH! What in the name of all that is holy is going on with Boris Becker’s elbow? The 46-year-old German tennis legend, serving in the capacity of tennis coach for superstar Novak Djokovic, was spotted at Billie Jean King National Tennis Centre sporting what only can be referred to as a severe, nightmare fuel case of tennis elbow.

Scratch that. The grotesque appearance of the joint on his left arm is more like “tennis ball elbow,” as it appears that was the objec what has been surreptitiously inserted into his arm.

Curiously, the elbow affected is on Becker’s left arm. Given he rose through the tennis ranks as a right-handed player, it’s conceivable the bulbous protrusion was caused by something other than tennis. Either way, it’s pretty darn disturbing.

Becker enjoyed a profoundly successful career on the court, winning 49 career singles titles highlighted by six Grand Slam victories, one of which occurred at the U.S. Open in 1989. One has to wonder if the disturbing arm protuberance was in fact caused by his tennis career if Becker feels it was all worth it. Something tells me it was.